[ https://issues.apache.org/jira/browse/HDFS-4156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13494286#comment-13494286
]
Hadoop QA commented on HDFS-4156:
---------------------------------
{color:green}+1 overall{color}. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12552872/HDFS-4156-3.patch
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author tags.
{color:green}+1 tests included{color}. The patch appears to include 1 new or modified
test files.
{color:green}+1 javac{color}. The applied patch does not increase the total number of
javac compiler warnings.
{color:green}+1 javadoc{color}. The javadoc tool did not generate any warning messages.
{color:green}+1 eclipse:eclipse{color}. The patch built with eclipse:eclipse.
{color:green}+1 findbugs{color}. The patch does not introduce any new Findbugs (version
1.3.9) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase the total number
of release audit warnings.
{color:green}+1 core tests{color}. The patch passed unit tests in hadoop-hdfs-project/hadoop-hdfs.
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/3474//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/3474//console
This message is automatically generated.
> Seeking to a negative position should throw an IOE
> --------------------------------------------------
>
> Key: HDFS-4156
> URL: https://issues.apache.org/jira/browse/HDFS-4156
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 1.0.0, 2.0.0-alpha
> Reporter: Eli Collins
> Assignee: Eli Reisman
> Labels: newbie
> Attachments: HDFS-4156-1.patch, HDFS-4156-2.patch, HDFS-4156-3.patch
>
>
> Credit to [~vanzin] for finding this. If you seek() to a position before the start of
the file, the seek() call succeeds, and the following read() call throws an NPE. A more friendly
approach would be to fail the seek() call.
> {noformat}
> Exception in thread "main" java.lang.NullPointerException
> at org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:670)
> at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:685)
> at java.io.DataInputStream.read(DataInputStream.java:83)
> at fstest.main(fstest.java:12)
> {noformat}
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